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-rw-r--r--Documentation/sysctl/kernel.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index fcddfd5ded99..daabdd7ee543 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -60,6 +60,7 @@ show up in /proc/sys/kernel:
- panic_on_warn
- perf_cpu_time_max_percent
- perf_event_paranoid
+- perf_event_max_stack
- pid_max
- powersave-nap [ PPC only ]
- printk
@@ -654,6 +655,19 @@ users (without CAP_SYS_ADMIN). The default value is 2.
==============================================================
+perf_event_max_stack:
+
+Controls maximum number of stack frames to copy for (attr.sample_type &
+PERF_SAMPLE_CALLCHAIN) configured events, for instance, when using
+'perf record -g' or 'perf trace --call-graph fp'.
+
+This can only be done when no events are in use that have callchains
+enabled, otherwise writing to this file will return -EBUSY.
+
+The default value is 127.
+
+==============================================================
+
pid_max:
PID allocation wrap value. When the kernel's next PID value